A Generalized Stochastic Implementation of the Disparity Energy Model for Depth Perception

Kaushik Boga, François Leduc-Primeau, Naoya Onizawa, Kazumichi Matsumiya, Takahiro Hanyu, Warren J. Gross

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Implementing neuromorphic algorithms is increasingly interesting as the error resilience and low-area, low-energy nature of biological systems becomes the potential solution for problems in robotics and artificial intelligence. While conventional digital methods are inefficient in implementing massively parallel systems, analog solutions are hard to design and program. Stochastic Computing (SC) is a natural bridge that allows pseudo-analog computations in the digital domain using low complexity hardware. However, large scale SC systems traditionally suffered from long latencies, hence higher energy consumption. This work develops a VLSI architecture for an SC based binocular vision system based on a disparity-energy model that emulates the hierarchical multi-layered neural structure in the primary visual cortex. The 3-layer neural network architecture is biologically plausible and is tuned to detecting 5 different disparities. The architecture is compact, adder-free, and achieves better disparity detection compared to a floating-point version by using a modified disparity-energy model. A generalized 1x100 pixel processing system is synthesized using TSMC 65nm CMOS technology and it achieves 71 % reduction in area-delay product and 48 % in energy savings compared to a fixed-point implementation at equivalent precision.

Original languageEnglish
Pages (from-to)709-725
Number of pages17
JournalJournal of Signal Processing Systems
Volume90
Issue number5
DOIs
Publication statusPublished - 2018 May 1

Keywords

  • Approximate computing
  • Biomedical electronics
  • Computer vision
  • Disparity-energy model
  • Gabor filters
  • Neural networks
  • Neuromorphic computing
  • Stochastic computing

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Theoretical Computer Science
  • Signal Processing
  • Information Systems
  • Modelling and Simulation
  • Hardware and Architecture

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